It was sorta fake:

It’s not as if the photographer, David Littschwager, strolled out into the sea, extracted an eye-dropper’s worth of sea water, and placed it onto a plate to photograph. Instead, a giant net collected up a bunch of zooplankton from a bunch of seawater, concentrating a swimming pool’s worth of the tiny organisms into a container the size of a drinking glass.

More at the link. So, now you don’t have to feel all icky if you go wading into the ocean.